MIxMaster Destiny is a 2d free to play mmorpg. 

In this game you need to build up your team of 3 monsters which are known as henches, There are 2 ways to get these henches either kill them in the wild if you're lucky you'll drop its core and you'll be able to use it. as the level of hench increases the harder dropping gets. 
The other way is to mix/fuse 2 henches together to form one stronger, you could call it fusion it is known as mixing in the game. But mixing isn't that easy there are 10 levels of mixing for each mix you gain mixing points which would increase your success rate for it. 
And there are many more things such as creating/ joining a guild going on guild wars and much more.